<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        /* 
            内外补白的叫法是相对的
        */
        .box{
            width: 200px;
            height: 200px;
            /* border: 1px solid red; */
            /* padding: 10px; */
            background-color: red;
            overflow: auto;
        }
        .son{
            width: 100px;
            height: 100px;
            border: solid;
            /* margin: 10px; */
            margin-top: 10px;
        }
        p {
            margin: 2px;
        }
        ul {
            padding-left: 10px;
        }
        * {
            margin: 0;
            padding: 0;
        }
    </style>
</head>
<body>
    <div class="box">
        <div class="son"></div>
    </div>
    <p>hello</p>
    <p>hello</p>
    <p>hello</p>
    <ul>
        <li>新闻</li>
        <li>体育</li>
        <li>娱乐</li>
        <li>科技</li>
    </ul>
</body>
</html>